Marshall JTM45
Name, numbering

Model number
Watts
Dates
Features
Notes
JTM45
35–45
1963–1964
2 channels, 4 inputs
Also available in bass and PA versions
1963
50
1965–1966
4 channels, 8 inputs
PA version; "JTM50 MK III"
1985
45
1965–1966
2 channels, 4 inputs
PA version of JTM50 MK II
1986
45
1965–1966
High treble and normal channels
Bass version of JTM50 MK II
1987
45
1965–1966
High treble and normal channels
Lead version of JTM50 MK II; also with tremolo as Model T1987
1989
45
1965–1966
For electronic organs
Also with tremolo as Model T1989
JTM 45 (2245)
30
1989–
2 channels, 4 inputs
Reissue of original JTM45 (1987)
2245THW
30
2014–
Handwired head, circuitry identical with Bluesbreaker
-

Question: What are the two remaining issues?
Answer: In 2014 Marshall reissued a "handwired" 30 W 2245THW based on the JTM45.